Audi A8/S8 Coolant Hose / Line / Tube 4H0121081AT

OEM Part #: 4H0-121-081-AT (4H0121081AT)

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Coolant Hose / Line / Tube for Audi models. OEM Part Number: 4H0121081AT. Designed for 2013-2018 Audi A8 Quattro and S8 with 4.0L V8 engines (engine code DDTA). This auxiliary vent tube plays a crucial role in maintaining proper coolant circulation and preventing overheating. Commonly addresses issues like coolant leaks due to wear or damage. Interchangeable with part numbers 3B0121321, 4H0121403N, 1H0121687A, 4H0121445K, 5Q0121321, 4H0121109C, N90926501, and 4H0121449N. Ensure efficient engine performance with this essential component.

Specifications

Specifications for Coolant Hose / Line / Tube 4H0121081AT
Fits Vehicle ModelA8, S8
Fits Vehicle MakeAudi
OEM Part No4H0-121-081-AT (4H0121081AT)
CategoryRadiator / Coolant

Compatible Vehicles

Fits 15 vehicle configurations across 1 make, 2013-2018.

Check your specific vehicle before ordering. This list shows year, make, and model. Some years have multiple trims or engines that use different parts, and individual listings may have additional fitment notes (e.g. “with sunroof only”). Review the full variant list below, or message us with your VIN and we’ll confirm the match.

Audi

  • A8 2013-2018 · 9 variants 5 with notes
  • S8 2013-2018 · 6 variants 4 with notes
View all 15 vehicle configurations — 9 with fitment notes
Full vehicle fitment list for Coolant Hose / Line / Tube 4H0121081AT
Year Make Model Trim Engine Note
2013 Audi A8 Quattro Sedan 4.0L V8 Turbo
2013 Audi A8 Quattro L Sedan 4.0L V8 Turbo
2013 Audi S8 Sedan 4.0L V8 Turbo
2014 Audi A8 Quattro Sedan 4.0L V8 Turbo
2014 Audi A8 Quattro L Sedan 4.0L V8 Turbo
2014 Audi S8 Sedan 4.0L V8 Turbo
2015 Audi A8 Quattro Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2015 Audi A8 Quattro L Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2015 Audi S8 Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2016 Audi A8 Quattro L Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2016 Audi S8 Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2017 Audi A8 Quattro L Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2017 Audi S8 Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2018 Audi A8 Quattro L Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA
2018 Audi S8 Sedan 4.0L V8 Turbo For Vehicles with Engine Code(s) CTFA, CTGA, CTGF, DDTA

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